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GB2136118A - A process and device for determining the composition of an alcohol-petrol mixture - Google Patents

A process and device for determining the composition of an alcohol-petrol mixture Download PDF

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Publication number
GB2136118A
GB2136118A GB08405529A GB8405529A GB2136118A GB 2136118 A GB2136118 A GB 2136118A GB 08405529 A GB08405529 A GB 08405529A GB 8405529 A GB8405529 A GB 8405529A GB 2136118 A GB2136118 A GB 2136118A
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Prior art keywords
mixture
degree
fuel
light beam
wavelength
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Granted
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GB08405529A
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GB8405529D0 (en
GB2136118B (en
Inventor
Paul Degobert
Michel Maute
Gerald Banet
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Publication of GB2136118A publication Critical patent/GB2136118A/en
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Publication of GB2136118B publication Critical patent/GB2136118B/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/082—Premixed fuels, i.e. emulsions or blends
    • F02D19/084—Blends of gasoline and alcohols, e.g. E85
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/082—Premixed fuels, i.e. emulsions or blends
    • F02D19/085—Control based on the fuel type or composition
    • F02D19/087—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/22—Fuels; Explosives
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G01N33/2852—Alcohol in fuels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0611—Fuel type, fuel composition or fuel quality
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Pathology (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

1 GB 2 136 118 A 1
SPECIFICATION A Process and Device for Determining the Composition of an Alcohol-Petrol Mixture
The present invention relates to a process and device for determining the composition of an alcohol-petrol mixture.
In order to use the different types of fuels which will be commercially available in the future, "flexible" or versatile engines capable of using various fuels will require an integrated system for adapting to different fuels, or to mixtures of different fuel formulations, on the one hand, and for automatically adjusting the engine operating conditions, e.g. the fuel/air ratio and the ignition system, on the other hand. A process and device for determining the composition of the fuel mixture is therefore required.
French Patent 2 487 010 and the article entitled "Probleemloze toepassing van alcoholbenzine-mengsels in auto's- published in 8 March 1981 on pages 117-122 of number 3 (volume 36) of the revue -Polytechnisch Tijdschrift Werktuigbouw- describe a device for measuring the percentage of alcohol in a fuel.
This device uses light transmission in a glass column but does not define the light absorbed by the fuel in the near infra-red. More generally, the use of the absorption of light in the near infra-red by an alcohol-petrol mixture for determining the composition of this mixture has not previously been described. The prior art may be illustrated by
U.S. Patents 4 369 736, 3 996 785, 4 031 864 and 4 321 465 and British Patent 1 554 309.
In one aspect, the invention provides a process for determining the composition of an alcohol petrol mixture which comprises passing a light beam through the mixture and determining the degree to which this beam is absorbed by the mixture for at least one wavelength chosen in the wavelength range corresponding to the near infra- 105 red, this degree of absorption being related to the alcohol content of the mixture.
By near infra-red is to be understood the part of the light spectrum corresponding to a wavelength between 0.7 and 1.7 micron (700 to 1700 110 nanometres).
In a further aspect, the invention provides a process for adjusting the operating parameters of a combustion engine fed with an alcohol-petroi mixture which comprises passing a light beam through the mixture supplying the engine, determining the degree to which this beam is absorbed by the mixture in a wavelength band chosen in the wavelength range corresponding to the near infra-red, and adjusting the operating 120 parameters of the engine according to the degree of absorption thus measured.
In one embodiment of the invention, the degree of absorption is determined for a wavelength between 900 and 1000 nanometres 125 (1 nanometre=l 0-9 metre).
In a second embodiment of the invention, thd degree of absorption is determined for a wavelength between 1 450 and 1 600 nanometres.
In the process of the invention, the degree to which the light beam is absorbed by the mixture may be compared with the degree to which a second beam, possibly from the same light source as the first beam, is absorbed by a reference fluid such as pure alcohol, or an alcohol-petrol mixture of known composition, in order to determine the composition of the mixture.
In a still further aspect, the invention provides a device for use in the automatic adjustment of at least one operating parameter of a combustion unit (such as an engine) fed with a fuel mixture containing petrol (such as an alcohol-petrol mixture), such as the air/fuel ratio of the supply, the ignition advance and/or the recycling rate of the unburnt gases, which device comprises a sensor having a light source to provide a light beam through a cell through which the mixture supplying the engine can flow, and a means for measuring the degree to which this beam is absorbed by any mixture flowing through the cell for at least one wavelength chosen in the wavelength range corresponding to the near infrared, this measurement means being capable of providing a signal depending on the measured degree of absorption.
The invention also provides a device such as defined above, wherein said measuring means is connected to means for adjusting at least one operating parameter of an engine as a function of said signal delivered by said measuring means.
In a particular embodiment, the device is characterized in that the sensor is disposed in series with a fuel pump in a supply pipe connecting the fuel reservoir to the engine, in that the reservoir has a fuel gauge adapted to produce a signal translating an increase in the volume of fuel in the reservoir, and in that a by-pass duct to the return pipe to the reservoir is disposed in the supply pipe and connected to means for controlling the by-pass, the control means being adapted for activation during a given time interval on receiving a control signal delivered by the gauge and related to an increase in the volume of fuel in the reservoir.
The invention is illustrated by way of example in the accompanying drawings, in which:
Figure 1 is a simplified general view of a device in accordance with the invention adapted for automatically adjusting the operation of an internal combustion engine; Figure 2 illustrates one embodiment of the sensor for measuring the composition of the fuel mixture; Figure 3 shows schematically the electric circuits associated with the sensor; Figure 4 shows the emission curve of a light emitting photo diode which may be used in the device of the invention; Figure 5 shows the percentage of light transmission for different components of fuel mixtures, as a function of the wavelength; and Figure 6 shows one example of a calibration curve of a measuring means such as those shown in Figure 3.
2 GB 2 136 118 A 2 The accompanying drawings illustrate one embodiment of the invention.
In Figure 1, illustrating schematically one embodiment of the invention, reference M designates an engine supplied with fuel from 70 reservoir 1 through pipe 2, in which is placed the petrol pump P and the device 3 for determining the alcohol content of the fuel. The level of fuel in reservoir 1 is measured by gauge 4. The air supply is provided through the air filter 5 by a pipe 6 passing through a heater 7 and in which is placed an electromagnetic valve 8 for adjusting the air supply. This supply is measured by sensor 9.
Other sensors 10 and 11, cooperating with a fly wheel 12 rotated by the engine, determine respectively the rotational speed of the engine and the passage of the piston through top dead center in each cylinder for each engine cycle.
A combustion sensor 13 determines any abnormal combustion cycles when pinking or knocking occurs.
A probe 14 placed in the exhaust gases determines whether these gases correspond to combustion of a stoichiometric fuel-air mixture.
The signals from the different sensors mentioned above and schematized by the letter C in the drawings are transmitted to an automatic data processing means (CALC) of the micro processor type which provides adjustment signals to the electromagnetic valve 8 and to a means 15 for controlling the ignition circuit 16 of the engine.
The automatic data processing means (CALC) may be adapted for automatically adjusting the ignition advance to an optimum value to avoid pinking, as a function of the signals received, in particular, from sensors 10, 11 and 13, for example in accordance with the process described in U.S. Patent 4 120 272.
Sensor 3 measuring the alcohol content of the 1 OEi fuel transmits its measuring signal to the processor (CALC) through the conductor 18.
This measurement may be made continuously or discontinuously. In the latter case, the last measurement made is stored by the processor, a 110 new measurement being made after each refilling of reservoir 1. For this purpose, gauge 4 may be adapted to deliver a signal to control means associated with the processor at each increase of the fuel level in reservoir 1. The processor then actuates, through conductor 19, a three-way electromagnetic valve 20, placed in the feed pipe 2 at the output of pump P, this electromagnetic valve opening a by- pass 21 connected to reservoir 1, so as to cause the fuel to flow in a closed circuit through pipe 2 and return pipe 21 to the reservoir for a given period of time (1 to 2 minutes for example) defined by the processor.
This operation allows homogenization of the fuel compositions in reservoir 1 and in the pipe and, at the end of the fixed period of time, the processor transmits to the electromagnetic valve 20 a signal causing the by-pass to the return pipe 21 to the reservoir to be closed in order to supply the engine with fuel.
The measurement of the alcohol content effected by sensor 3 and transmitted through conductor 19 is the-n recorded by the processor, where it replaces the value previously stored by this latter, after the preceding replenishment of reservoir 1 with fuel.
It will be appreciated that it would also be possible to dispose sensor 3 in pipe 2 1.
In Figure 2 illustrating one embodiment of sensor 3 for determining the composition of the fuel mixture, reference 22 designates the body of this sensor, formed from a light alloy block. This block is pierced with a bore 23 in which is housed a light source 24 which may be formed by a light- emitting diode of the LEDME type 7124 from General Instrument emitting an infra-red light beam 25 (average wavelength 940 nanometres). This beam is divided into two by a semi-reflecting separating plate 26, with parallel faces, carried by a support 27 situated at the intersection of two other bores 28 and 29 in block 22. The axes of these two bores are perpendicular, the axis of bore 28 coinciding with that of bore 23.
A part of beam 25 is reflected towards a first photometer such as a photo-transistor 30 through a measuring cell 3 1. This measuring cell 3 1, having a window 32 made from a material which only weakly absorbs the emitted radiation, comprises input and output tubes, 33 and 34 respectively, connected to pipe 2 of the fuel feed circuit of the engine, so as to have passing therethrough the alcohol-petrol mixture supplying the engine. A filter 37 is placed in the input tube of the sensor (Figure 3).
The other part of beam 25 passes through the separating plate 26 and reaches a second photometer such as a photo-transistor 35 through a cell 36 having the window 38, and preferably similar to the measuring cell 3 1, but containing a reference liquid of known composition, for example pure methanol (CH30H).
If desired, this reference cell may be replaced by a simple filter having known absorption characteristics preferably substantially equivalent to those which the measuring cell would have if it were filled with an alcohol and petrol mixture whose composition were known.
A comparison of the respective degrees of absorption of the radiation by the liquid flowing through the measuring cell 31 and by the liquid contained in the rererence cell 36 may be provided by means of a differential amplifier 39 whose two inputs are connected respectively to the photo-transistors 30 and 35 (Figure 3).
The measurement signal S delivered by the differential amplifier 39 is transmitted to the processor through the conductor 18.
Figure 3, in which the reference +V designates an electric voltage source (for example 10 volts), shows moreover schematically how automatic regulation of the light flux produced by the light emitting photo-diode 24 may be achieved. To this end, an amplifier of the follower type A1 is connected to the emitter of the reference photo- transistor 35. The output signal of this follower, 3 GB 2 136 118 A 3 which is applied to one of the two inputs of the differential amplifier 39, is transmitted to a first input of a servo system comprising an operational amplifier A whose second input terminal is brought to a reference electric voltage V,. The output terminal of the operational amplifier A1 is connected through a follower A2 to the base of a transistor whose emitter is connected to the light emitting diode 24.
This regulation system operates as follows: if the electric voltage delivered by the photo transistor 35 associated with the reference cell 36 decreases (e.g. because of ageing of the diode 24 or because of dirt in the window of the reference cell 36), the operation amplifier A controls, depending on the difference between this voltage and the reference voltage V,, an increase in the supply voltage of the light emitting diode 24 so as to re- establish at the desired level the light flux emitted by this diode. - Figure 4 shows the characteristic emission curve of a photo-diode (photo- diode I.R.ME 7124) which may be used for the light emitting diode 24 of sensor 3. In this Figure, the wavelength A in nanometres is shown on the abscissa, the relative emission ER being plotted as the ordinate.
Figure 5 shows the percentage light transmission for different fuel mixture constituents as a function of the wavelength A in nanometres.
The measurement signal S delivered by the differential amplifier 39 is proportional to the difference of the input signals. The zero of this amplifier is adjusted when the two cells 31 and 36 both contain the reference liquid (e.g. CH301-1) and the gain adjustment of this amplifier 39 for the full scale is effected when the measuring cell 31 contains pure petrol, the reference cell 36 still containing e.g. pure methanol.
Figure 6 shows a calibration curve fora sensor 100 such as the one illustrated in Figure 3.
This curve gives the value of the measurement signal S transmitted to the processor (CALC) as a function of the methanol (CH30H) percentage.
By way of example, for fuels comprising methanol-petrol mixtures, if V, designates the volume of mixture 1 with a density D1 contained in the reservoir before replenishment effected at the service station and if V2 designates the volume of mixture 2 delivered by theservice station pump, (A/F), and (A/F), being the characteristic stoichiometric ratios of mixtures 1 and 2 respectively, the values V,, D, and (A/03 of the resulting mixture 3 obtained in the reservoir are related to the preceding ones by the volumetric relationships:
with and The automatic data processing means (CALC) may be adapted to determine, after each reservoir replenishment, the values W%, V3 and D, of the resulting mixture 3 on the basis of the three above relationships (1), (2) and (3) from the initial values (A/F),, V, and D, and from the values (AM2, and V2 and D2 characterizing the replenishment effected.
It will be appreciated that a light beam separation means may be used other than a separating plate, this means being adapted to separate the incident light beam into at least two other beams. Such a means may, for example, be an optical fiber in the shape of a Y, or by periodically deflecting the incident beam for example by using an oscillating mirror or any other device of the same kind. Similarly, two different light sources may be used having preferably substantially identical characteristics, one of these sources emitting radiation towards the measuring cell and the other towards the reference cell.
The present invention may be applied to mixtures other than alcohol-petrol mixtures, for example to a mixture containing at least one oxygenated product and petrol.
VA(A/F),+V,1),(A/H2=V3 D 3 (A/F)3 (1) Vi+V2C!N3 (within 0.4%) (2) V1131+V2132 _ D3 vi+V2

Claims (17)

1. A process for determining the composition of an alcohol-petrol mixture which comprises passing a light beam through the mixture and determining the degree to which this beam is absorbed by the mixture for at least one wavelength, said wavelength being chosen in the wavelength range corresponding to the near infrared and the degree of absorption being related to the alcohol content of the mixture.
2. A process for adjusting the operating parameters of a combustion engine fed with an alcohol-petrol mixture which comprises passing a light beam through the mixture supplying the engine, determining the degree to which this beam is absorbed by the mixture in a wavelength band chosen in the wavelength range corresponding to the near infra-red, and adjusting the operating parameters of the engine according to the degree of absorption thus measured.
3. A process as claimed in either of claims 1 and 2 wherein the degree of absorption is determined for a wavelength between 900 and 1 000 nanometres.
4. A process as claimed in either of claims 1 and 2 wherein the degree of absorption is determined for a wavelength between 1 450 and 1 600 nanometres.
5. A process as claimed in claim 1 wherein the degree to which the light beam is absorbed by the mixture is compared with the degree to which a second light beam is absorbed by a reference liquid in order to determine the composition of the mixture.
6. A process for determining the composition of an alcohol-petrol mixture substantially as herein described with reference to the accompanying drawings.
4 GB 2 136 118 A 4
7. A device for use in the adjustment of at least one operating parameter of a combustion unit fed with a fuel mixture containing petrol, which device comprises a sensor having a light source to provide a light beam through a cell through which the mixture supplying said combustion unit can flow, and a means for measuring the degree to which this beam is absorbed by any mixture flowing through the cell for at least one wavelength chosen in the wavelength range corresponding to the near infra- red, this measuring means being capable of providing a signal depending on the measured degree of absorption.
8. A device as claimed in claim 7 wherein the combustion unit comprises an engine and said measuring means is connected to means for adjusting at least one operating parameter of the engine, as a function of said signal delivered by said measuring means.
9. A device as claimed in claim 8, wherein said sensor is disposed in series with a fuel pump in a supply pipe connecting a fuel reservoir to the engine, said reservoir has a fuel gauge adapted to produce a signal translating an increase in volume of fuel in the reservoir, and a by-pass valve towards a return pipe to the reservoir is disposed in the supply pipe and connected to means for controlling the by-pass, the control means being adapted to be activated during a given time interval on receiving a control signal delivered by the gauge and related to an increase in the 65 volume of fuel in the reservoir.
10. A device as claimed in any one of claims 7 to 9, wherein said sensor comprises a first photometer for receiving at least a part of the light beam emitted by the light source after the beam has passed through the measuring cell through which the mixture suplying said combustion unit can flow, and a second photometer for receiving at least a part of the light beam emitted by the light source, after this latter has passed through a second reference cell.
11. A device as claimed in claim 10, wherein the reference cell is substantially identical to the measuring cell except that it contains a reference liquid.
12. A device as claimed in claim 11, wherein said reference liquid is alcohol. 50
13. A device as claimed in any one of claims 10 to 12, wherein there is further provided a plate for separating the light beam emitted by the light source.
14. A device as claimed in claim 10, further comprising a means for separating the incident light beam into at least two other beams.
15. A device for use in the adjustment of at least one operating parameter of a combustion unit substantially as herein described with reference to the accompanying drawings.
16. Apparatus for the automatic adjustment of at least one operating parameter of a combustion unit comprising a device as claimed in claim 7.
17. Each and every novel process, method, device and apparatus substantially as herein described.
Printed in the United Kingdom for Her Majesty's Stationery Office, Demand No. 8818935, 911984. Contractor's Code No. 6378. Published by the Patent Office, 25 Southampton Buildings, London, WC2A JAY, from which copies may be obtained.
a i Ii k i;
GB08405529A 1983-03-03 1984-03-02 A process and device for determining the composition of an alcohol-petrol mixture Expired GB2136118B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8303663A FR2542092B1 (en) 1983-03-03 1983-03-03 METHOD AND DEVICE FOR DETERMINING THE COMPOSITION OF AN ALCOHOL-PETROL MIXTURE, SUITABLE FOR AUTOMATIC ADJUSTMENT OF ENGINES FUEL COMBUSTIBLE WITH A VARIABLE ALCOHOL CONTENT

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GB8405529D0 GB8405529D0 (en) 1984-04-04
GB2136118A true GB2136118A (en) 1984-09-12
GB2136118B GB2136118B (en) 1986-07-30

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US (1) US4594968A (en)
JP (1) JPH07111396B2 (en)
KR (1) KR920007891B1 (en)
AT (1) AT397435B (en)
AU (1) AU576314B2 (en)
BE (1) BE899068A (en)
BR (1) BR8400976A (en)
CA (1) CA1227262A (en)
CH (2) CH660771A5 (en)
DE (1) DE3407844C2 (en)
DK (1) DK160780C (en)
ES (2) ES8504389A1 (en)
FR (1) FR2542092B1 (en)
GB (1) GB2136118B (en)
IT (1) IT1173400B (en)
NL (1) NL8400703A (en)
NZ (1) NZ207351A (en)
PT (1) PT78186B (en)
SE (1) SE454809B (en)
ZA (1) ZA841582B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194333A (en) * 1986-07-01 1988-03-02 Electricity Council Detection method and device
EP0304230A2 (en) * 1987-08-21 1989-02-22 The British Petroleum Company P.L.C. Optical measurement method
EP0335168A2 (en) * 1988-03-30 1989-10-04 FEV Motorentechnik GmbH & Co. KG Method of operating a combustion engine
WO1990006427A1 (en) * 1988-12-10 1990-06-14 Robert Bosch Gmbh Fuel control system
GB2236872A (en) * 1989-08-08 1991-04-17 Fuji Heavy Ind Ltd Controlling dual fuel engine
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ES8605641A1 (en) 1986-03-16
DE3407844C2 (en) 1995-04-06
PT78186A (en) 1984-04-01
FR2542092A1 (en) 1984-09-07
US4594968A (en) 1986-06-17
ES530272A0 (en) 1985-04-16
ES539273A0 (en) 1986-03-16
BE899068A (en) 1984-09-03
FR2542092B1 (en) 1986-02-28
ATA63984A (en) 1993-08-15
SE8401117L (en) 1984-09-04
KR920007891B1 (en) 1992-09-18
ES8504389A1 (en) 1985-04-16
DE3407844A1 (en) 1984-09-06
NL8400703A (en) 1984-10-01
AU576314B2 (en) 1988-08-25
AU2524984A (en) 1984-09-06
SE454809B (en) 1988-05-30
CH658914A5 (en) 1986-12-15
AT397435B (en) 1994-04-25
JPH07111396B2 (en) 1995-11-29
GB8405529D0 (en) 1984-04-04
DK160780B (en) 1991-04-15
CH660771A5 (en) 1987-06-15
GB2136118B (en) 1986-07-30
DK137984A (en) 1984-09-04
SE8401117D0 (en) 1984-02-29
DK137984D0 (en) 1984-02-29
PT78186B (en) 1986-05-20
BR8400976A (en) 1984-10-09
KR840008031A (en) 1984-12-12
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CA1227262A (en) 1987-09-22
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ZA841582B (en) 1985-10-30
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JPS59210345A (en) 1984-11-29
IT8419839A0 (en) 1984-02-29

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